Giant 20' x 3' x 2' router build

[EddyCurrent]

Thanks for the suggestions anyway


so what do we think the next step is? Run a 3 core wire and try that instead of having them all together?

That's what I suggested earlier but using single core wire. Capacitance acts like a time delay and that's what you are getting.
Better still use a piece of CAT 5 twisted pair, it's imunity to noise is good.

[charlieuk]

That's what I suggested earlier but using single core wire. Capacitance acts like a time delay and that's what you are getting.
Better still use a piece of CAT 5 twisted pair, it's imunity to noise is good.

Sorry I must have missed that I will give it a try.

[charlieuk]

We'll I tried 3 core shielded the full length and no luck I actually had to set the filter higher but still had the same effect. Running out of ideas, perhaps try a short run of cable just long enough to go straight from the box to the switch? Or try a different type of switch

[charlieuk]

I'm not giving in! Just wired a short length of cable (2m) straight from the csmio to the same switch and it works perfect so I ether need to some how change the wiring or the switches.

[EddyCurrent]

For limits I prefer this type, mechanical with a roller arm. I assume your Home switches are close to the control unit ?

http://www.ebay.co.uk/itm/ME-8108-Mo...algo=undefined

Also looking at some earlier photo's I don't like the look of your 'target' for the sensor. It looks like a stainless cap head screw, try a piece of flat mild steel instead or a large steel bolt head for example.

[charlieuk]

The home switches are all on the gantry the only or that could be made closer to the control box is the x home. The triggers are at the moment a stainless bolt in a alli washer I will try all steel now

[charlieuk]

just tried just a steel bolt and it still had the fault

[EddyCurrent]

just tried just a steel bolt and it still had the fault

Did it have a hole in the middle like the cap head screw or was it solid metal right across and at least the same diameter as the proximity switch ?

This is from Baumer inductive sensors catalogue.
Baumer

"Maximum cable length A large cable length is a capacitive load for the output circuit and increases the influence of interference. Length should therefore be kept as short as possible."

They don't quote a figure for max length though.

This is why I suggested using single core bits of wire just as a test over the distance, the capacitance is going to be low if they are kept well apart.

Save yourself the grief and fit mechanical switches for limits, you won't have these problems then.